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Shudder / vibe lasts about 1 second
For the second time in 6 months I've had a short duration (less than a second) shudder/vibration seemly from the prop or engine. Nothing comes up (flatline) on the egt or cht strips. There is no RPM change. Both times we were straight and level. Both times was about 5-10 mins after takeoff. Total time on plane about 200. It won't replicate with changes in RPM. MP. Or fuel flow, altitude or AS. Any thoughts?
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Bart-
If you have a way to download your EMS to a data sheet capturing that time period you might get an indication of what is taking place. Good Luck, |
Vibe
Sounds a lot like a plug problem. At what power setting does this happen?
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I can download the data. I'll take a look at it later tonight. The power setting was roughly 23 inches and 2200 both times.
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If you have EMS - do you capture oil pressure? Anything happening there?
Dan |
Bart,
Send me a copy of the engine monitor file. davidbrown 'at' advancedpilot.com There are a couple of things I can think of that will cause this, and even some rare bizarre things. Can you also tell me the following; Stage of flight i.e. just after TOC ? Plugs: Brand, when were they gapped last. Mags: Are the Mags or EI's Fuel: What type are you using EMS data log time interval If you can, pin point the exact time these events occur in the data. I will see what I can see?. :) |
Well it looks like I had record turned off. So no data to show. With that said there we no anomalies that I caught in the cross check. No change in RPM no change in CHT / EGT. I'm recording now. I hate to chalk it up to a fouled plug but not sure I have much else to go on.
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It could be many things, getting the data would be good for beginning a diagnosis. Generally, a single plug would work or not work, but not typically a transient misfire, so that is (probably) why David asked for the situation to better narrow the possibilities.
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Yep, I get that. I've got the EFIS set to record now. Seems weird to have two seconds of events spread out over 6 months but the shudder/vibe is enough to get your attention. The first time it happened I thought I had a bird go through the prop.
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Bart,
Data lacking, can you please answer my questions as accurately as possible. I may still have some suggestions for you, but I do not want to send you on a goose chase either. |
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